ACQE-5692: fixed flaky test found in isolated run.

Author: jilu1

app/code/Magento/Catalog/Test/Mftf/ActionGroup/StorefrontAssertCategoryNameIsShownInMenuActionGroup.xml

@@ -16,6 +16,7 @@
             <argument name="categoryName" type="string"/>
         </arguments>
 
+        <waitForElementVisible selector="{{StorefrontHeaderSection.NavigationCategoryByName(categoryName)}}" stepKey="waitForCatName" time="90"/>
         <seeElement selector="{{StorefrontHeaderSection.NavigationCategoryByName(categoryName)}}"
                     stepKey="seeCatergoryInStoreFront"/>
     </actionGroup>

app/code/Magento/Catalog/Test/Mftf/Test/StorefrontCategorySidebarMobileMenuTest.xml

@@ -42,15 +42,16 @@
         <click selector="{{StorefrontHeaderSection.mobileMenuToggle}}" stepKey="openSideMenu"/>
         <waitForElementClickable selector="{{StorefrontHeaderSection.NavigationCategoryByName($$createParentCategory.name$$)}}" stepKey="waitForCategoryMenuClickable" />
         <click selector="{{StorefrontHeaderSection.NavigationCategoryByName($$createParentCategory.name$$)}}" stepKey="expandCategoryMenu"/>
-        <waitForPageLoad stepKey="waitForSearchResult"/>
 
         <!-- Assert the category expanded successfully -->
         <actionGroup ref="StorefrontAssertCategoryNameIsShownInMenuActionGroup" stepKey="verifySubCatMenuItemIsVisibleInTheSidebar">
             <argument name="categoryName" value="$$createSubCategory.name$$"/>
         </actionGroup>
 
         <!-- Open the subcategory and assert it opened successfully -->
+        <waitForElementClickable selector="{{StorefrontHeaderSection.NavigationCategoryByName($$createSubCategory.name$$)}}" stepKey="waitForSubCategory" time="90"/>
         <click selector="{{StorefrontHeaderSection.NavigationCategoryByName($$createSubCategory.name$$)}}" stepKey="openSubCategory"/>
+        <waitForElementVisible selector="{{StorefrontCategoryMainSection.CategoryTitle}}" stepKey="waitForCategoryName" time="90"/>
         <see userInput="$$createSubCategory.name$$" selector="{{StorefrontCategoryMainSection.CategoryTitle}}" stepKey="assertCategoryName"/>
     </test>
 </tests>